Translation:

51. Give the warning to those in whose (hearts) is the fear that they will be brought (to judgment) before their Lord: except from Him they will have no protector nor intercessor: that they may guard (against evil).

Notes (Tafseer)

869. There are some men - sinners - who yet believe in Judgement; let them be warned of their personal responsibility to guard against evil; let them not rely upon protectors or intercessors before God; their sins can only be forgiven by God's own Mercy.